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WGC-1 (M#20) in purple.+
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WGC-1.1 in brown. Same as WGC-1 except for color.+
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WGC-1A in purple on airmail envelope. Same as WGC-1 except for envelope style.
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WGC-1B in purple. Similar to WGC-1 but the word "INVENTION" appears in the second line of text at the top instead of the first. Bottom line of text is in a smaller font.+
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WGC-2 (M#27) in purple. Two lines of text at the top, none at the bottom.+
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WGC-2A in brown. Same as WGC-2 except for color.+
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WGC-3 (M#28) in purple. Similar to WGC-2 but three lines of text at the top, one line at the bottom.+
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WGC-3A in purple. Like WGC-3 but no text at the bottom.+
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WGC-3B in purple on airmail envelope. Same as WGC-3A except for envelope style.
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WGC-3B in purple. Like WGC-3A but extra spacing at the top.
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WGC-4 (M#23) in purple. No photo variety.+
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WGC-4A in purple. Similar to WGC-4 but the word "INVENTION' appears in the second line of text at the top instead of the first and the text in the paragraphs is spaced differently.+
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WGC-5 (M#24) in purple. Similar to WGC-4 but with District of Columbia Seal. First line under seal reads: 'FIRST DAY COVER Washington, D. C.' Reduced paragraph text below seal.+
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WGC-6 (M#26) in purple. Five stars below top three lines of text.+
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WGC-6A (M#25) in purple. Like WGC-6 but no stars.
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WGC-7 in red.
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